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Finding the Fourth Proportional to 258,666.70, 388,058.43 and 78,768.22

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Solution

The fourth proportional to 258,666.70, 388,058.43 and 78,768.22 is: 118,170.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,666.70 : 388,058.43 = 78,768.22 : x
  2. Step 2: Convert to fraction form
    258,666.70/388,058.43 = 78,768.22/x
  3. Step 3: Cross multiply
    258,666.70x = 388,058.43 × 78,768.22
  4. Step 4: Simplify right side
    258,666.70x = 30,566,672,820.59
  5. Step 5: Solve for x
    x = 30,566,672,820.59/258,666.70
  6. Step 6: Final answer
    x = 118,170.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.